docs: def gfposc(target, inframe, abcorr, obsrvr, crdsys, coord, relate, refval,
             adjust, step, nintvals, cnfine, result=None):
      """
      Determine time intervals for which a coordinate of an
      observer-target position vector satisfies a numerical constraint.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/gfposc_c.html
  
      :param target: Name of the target body.
      :type target: str
      :param inframe: Name of the reference frame for coordinate calculations.
      :type inframe: str
      :param abcorr: Aberration correction flag.
      :type abcorr: str
      :param obsrvr: Name of the observing body.
      :type obsrvr: str
      :param crdsys: Name of the coordinate system containing COORD
      :type crdsys: str
      :param coord: Name of the coordinate of interest
      :type coord: str
      :param relate: Relational operator.
      :type relate: str
      :param refval: Reference value.
      :type refval: float
      :param adjust: Adjustment value for absolute extrema searches.
      :type adjust: float
      :param step: Step size used for locating extrema and roots.
      :type step: float
      :param nintvals: Workspace window interval count.
      :type nintvals: int
      :param cnfine: SPICE window to which the search is restricted.
      :type cnfine: spiceypy.utils.support_types.SpiceCell
      :param result: Optional SPICE window containing results.
      :type result: spiceypy.utils.support_types.SpiceCell
      """
      assert isinstance(cnfine, stypes.SpiceCell)
      assert cnfine.is_double()
      if result is None:
          result = stypes.SPICEDOUBLE_CELL(2000)
      else:
          assert isinstance(result, stypes.SpiceCell)
          assert result.is_double()
      target = stypes.stringToCharP(target)
      inframe = stypes.stringToCharP(inframe)
      abcorr = stypes.stringToCharP(abcorr)
      obsrvr = stypes.stringToCharP(obsrvr)
      crdsys = stypes.stringToCharP(crdsys)
      coord = stypes.stringToCharP(coord)
      relate = stypes.stringToCharP(relate)
      refval = ctypes.c_double(refval)
      adjust = ctypes.c_double(adjust)
      step = ctypes.c_double(step)
      nintvals = ctypes.c_int(nintvals)
      libspice.gfposc_c(target, inframe, abcorr, obsrvr, crdsys, coord,
                        relate, refval, adjust, step, nintvals,
                        ctypes.byref(cnfine), ctypes.byref(result))
      return result